scrapd.assign source code

1 ///
2 module scrapd.assign;
3 
4 ///
5 void assign(T, U)(ref T target, scope U source)
6 {
7     static foreach (prop; __traits(allMembers, T))
8     {
9         static if (__traits(compiles, {
10                 __traits(getMember, target, prop) = __traits(getMember, source, prop);
11             }))
12         {
13             __traits(getMember, target, prop) = __traits(getMember, source, prop);
14         }
15     }
16 }
17 
18 ///
19 unittest
20 {
21     struct A
22     {
23         int x;
24         int y;
25     }
26     struct B
27     {
28         int x;
29         float z;
30     }
31 
32     A a = { x: 10, y: 20 };
33     B b = { x: 1, z: 1.0f };
34     assign(a, b);
35 
36     assert(a.x == 1);
37 }
38 
39 unittest
40 {
41     struct A
42     {
43         float x;
44         int y;
45     }
46     struct B
47     {
48         int x;
49         float y;
50     }
51 
52     A a = { x: 10.0f, y: 20 };
53     B b = { x: 1, y: 1.0f };
54     assign(a, b);
55 
56     assert(a.x == 1.0f);
57     assert(a.y == 20); // non compatible types
58 }